The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2007
Filed:
Mar. 19, 2003
Masao Imaki, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Sato, Tokyo, JP;
Akihiro Adachi, Tokyo, JP;
Shinichi Takagi, Tokyo, JP;
Yasunori Nisimura, Tokyo, JP;
Masao Imaki, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Sato, Tokyo, JP;
Akihiro Adachi, Tokyo, JP;
Shinichi Takagi, Tokyo, JP;
Yasunori Nisimura, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A wavelength filter includes a solid material that is optically transparent and including a pair of planar surfaces substantially parallel to each other; and a supporting member that supports the solid material on a planar surface of the solid material other than the pair of planar surfaces, the supporting member having a rigidity higher than that of the solid material. The solid material is a birefringent material of which an optical axis makes a predetermined angle with respect to a normal to the pair of planar surfaces, and the wavelength filter selects light having a wavelength that is determined by an optical length between the pair of planar surfaces by resonating the light between the pair of planar surfaces.